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| MCP98243 Memory Module Temperature Sensor w/ EEPROM for SPD Features * * * * * Meets JEDEC Specification JC42.4-TSE2002B3 Temperature Sensor + 2 Kbit Serial EEPROM EEPROM for Serial Presence Detect (SPD) 2-wire I2CTM/SMBus Interface Available Packages: - DFN-8, TDFN-8, UDFN-8, TSSOP-8 Description Microchip Technology Inc.'s MCP98243 digital temperature sensor converts temperature from -40C and +125C to a digital word. This sensor meets JEDEC Specification JC42.4-TSE2002B3 Platform Memory Module Thermal Sensor Component. It provides an accuracy of 0.2C/1C (typical/ maximum) from +75C to +95C. In addition, this device has an internal 256 Byte EEPROM which can be used to store memory module and vendor information. The MCP98243 digital temperature sensor comes with user-programmable registers that provide flexibility for DIMM temperature-sensing applications. The registers allow user-selectable settings such as Shutdown or Low-Power modes and the specification of temperature Event boundaries. When the temperature changes beyond the specified Event boundary limits, the MCP98243 outputs an Alert signal at the Event pin. The user has the option of setting the temperature Event output signal polarity as either an active-low or active-high comparator output for thermostat operation, or as a temperature Event interrupt output for microprocessor-based systems. The EEPROM is designed specifically for DRAM DIMMs (Dual In-line Memory Modules) Serial Presence Detect (SPD). The lower 128 Bytes (address 0x00 to 0x7F) can be Permanent Write Protected (PWP) or Software Reversible Write Protected (SWP). This allows DRAM vendor and product information to be stored and write protected. The upper 128 bytes (address 0x80 to 0xFF) can be used for general purpose data storage. These addresses are not write protected. This sensor has an industry standard 2-wire, I2C compatible serial interface, allowing up to eight devices to be controlled in a single serial bus. Temperature Sensor Features * Temperature-to-Digital Converter * Sensor Accuracy (Grade B): - 0.2C/1C (typ./max.) +75C to +95C - 0.5C/2C (typ./max.) +40C to +125C - 1C/3C (typ./max.) -20C to +125C * Specified VDD Range: 3.0V to 3.6V * Operating Current: 200 A (typical) * Operating VDD Range: 2.7V to 5.5V Serial EEPROM Features * Specified VDD Range: 1.8V to 5.5V * Operating Current: - Write 1.1 mA (typical) for 3.5 ms (typical) - Read 100 A (typical) * Permanent and Reversible Software Write Protect * Software Write Protection for the lower 1 Kbit * Organized as 1 block of 256 x 8-bit (2 Kbit) Typical Applications * DIMM Modules for Servers, PCs, and Laptops * General Purpose Temperature Datalog DIMM MODULE Package Types 8-Pin 2x3 DFN/TDFN/UDFN * A0 1 A1 2 A2 3 GND 4 EP 9 8 VDD 7 Event 6 SCL 5 SDA 8-Pin TSSOP A0 1 A1 2 A2 3 8 VDD 7 Event 6 SCL 5 SDA GND 4 * Includes Exposed Thermal Pad (EP); see Table 3-1. MCP98243 (c) 2009 Microchip Technology Inc. DS22153B-page 1 MCP98243 Sensor Typical Accuracy Performance 50% 40% Occurrences 30% 20% 10% 0% -0.2 -1.0 -0.8 -0.6 -0.4 0.8 100 kHz VIL_MAX = 0.8V, VIH_MIN = 2.1V 8V to 12V -- 0.5V 0x2001 TA = +85C 1,063,478 units 63 Production lots Statistics: Average = 0.003 C St. Dev = 0.13 C 3 Sigma = 0.4 C 0.0 0.2 0.4 0.6 Temperature Accuracy (C) Note: This accuracy data from the production system represents the typical accuracy performance of the MCP98242 Memory Module Temperature Sensor. The MCP98242 production methodology is also used for the MCP98243 to achieve the same typical accuracy performance. MCP98243 VS. MCP98242 Feature Event Output in Shutdown Mode I2C 2C MCP98243 Event Output De-asserts tOUT = 25 ms to 35 ms 400 kHz VIL_MAX=0.3*VDD, VIH_MIN=0.7*VDD 7V to 12V 50 ns 0.05VDD 0x2101 (hex) MCP98242 Event Output Remains Asserted tOUT = 20 ms to 35 ms communication Timeout Range I2C Maximum Bus Frequency I SCL & SDA VIL/VIH voltage levels VHV A0 range I C Spike Supression I2C input hysteresis Device/Revision ID Register 2 DS22153B-page 2 (c) 2009 Microchip Technology Inc. 1.0 MCP98243 1.0 ELECTRICAL CHARACTERISTICS Notice: Stresses above those listed under "Maximum ratings" may cause permanent damage to the device. This is a stress rating only and functional operation of the device at those or any other conditions above those indicated in the operational listings of this specification is not implied. Exposure to maximum rating conditions for extended periods may affect device reliability. Absolute Maximum Ratings VDD.................................................................................. 6.0V Voltage at all Input/Output pins ............... GND - 0.3V to 6.0V Pin A0 ................................................... GND - 0.3V to 12.5V Storage temperature .....................................-65C to +150C Ambient temp. with power applied ................-40C to +125C Junction Temperature (TJ) .......................................... +150C ESD protection on all pins (HBM:MM) ................. (4 kV:300V) Latch-Up Current at each pin (25C) ....................... 200 mA TEMPERATURE SENSOR DC CHARACTERISTICS Electrical Specifications: Unless otherwise indicated, VDD = 3.0V to 3.6V, GND = Ground, and TA = -20C to +125C. Parameters Temperature Sensor Accuracy +75C < TA +95C +40C < TA +125C -20C < TA +125C TA = -40C Temperature Conversion Time 0.25C/bit Power Supply Specified Voltage Range Operating Voltage Range Operating Current Shutdown Current Power On Reset (POR) Power Supply Rejection, TA = +25C High-level Current (leakage) Low-level Voltage Low-level Current (leakage) High-level Voltage IOH VOL IOL VOH VDD VDD IDD_TS ISHDN VPOR_TS C/VDD 3.0 2.7 -- -- -- -- -- -- -- -- -- -- -- 200 1 2.2 0.3 0.15 -- -- -- -- 3.6 5.5 500 3 -- -- -- 1 0.4 1 VDD-0.5 V V A A V C/V C A V A V JC42.4 Specified Voltage Range Note 1 EEPROM Inactive EEPROM Inactive, I2C Bus Inactive Threshold for falling VDD voltage VDD = 2.7V to 5.5V VDD = 3.3V+150 mVPP AC (0 to 1 MHz) VOH = VDD (Active-Low, Pull-up Resistor) IOL= 3 mA (Active-Low, Pull-up Resistor) VOL = VSS (Active-High, Pull-down Resistor) IOH= 3 mA (Active-High, Pull-down Resistor) Time to 63% (89C) tCONV -- 65 125 ms 15 s/sec (typical) (See Section 5.2.4) TACY -1.0 -2.0 -3.0 -- 0.2 0.5 1 -1 +1.0 +2.0 +3.0 -- C C C C JC42.4 - TSE2002B3 Grade B Accuracy Specification Sym Min Typ Max Unit Conditions Event Output (Open-Drain output, external pull-up or pull-down resistor required), see Section 5.2.3 Thermal Response, from +25C (Air) to +125C (oil bath) DFN/UDFN/TDFN-8 TSSOP-8 Note 1: tRES -- -- 0.7 1.4 -- -- s s Characterized but not production tested. Also, see Section 2.0 "Typical Performance Curves". (c) 2009 Microchip Technology Inc. DS22153B-page 3 MCP98243 EEPROM DC CHARACTERISTICS Electrical Specifications: Unless otherwise indicated, VDD = 1.8V to 5.5V, GND = Ground, and TA = -20C to +125C. Parameters Power Supply Operating Voltage Range Current, EEPROM write Current, EEPROM read Power On Reset (POR) Write Cycle time (byte/page) Endurance TA = +25C EEPROM Write Temperature EEPROM Read Temperature Write Protect Voltage SWP and CWP Voltage PWP Voltage Note 1: 2: 3: VHV 7 -- -- VDD 12 -- V V Applied at A0 pin (Note 3) VDD IDD_EE IDD_EE VPOR_EE tWC -- EEWRITE EEREAD 1.8 -- -- -- -- -- 0 -40 -- 1100 100 1.6 3 1M -- -- 5.5 2000 500 -- 5 -- 85 125 V A A V ms cycles Number of Write Cycles, VDD = 5V (Note 2) C C Sensor in Shutdown Mode (for tWC), (Note 1) Sensor in Shutdown Mode (Note 1) EEPROM Sym Min Typ Max Unit Conditions For VDD ranges of 1.8V to the temperature sensor VPOR_TS, the temperature sensor becomes partially biased and consumes 80 A (typical) until the sensor POR resets and acknowledges a shutdown command. See Figure 2-15. Characterized but not production tested. For endurance estimates in a specific application, please consult the Total EnduranceTM Model which can be obtained from Microchip's web site at www.microchip.com. The range of voltage applied at A0 pin for Permanent Write Protect is GND to VDD + 1V. See Figure 2-13 and Section 5.3.3 "Write Protection". INPUT/OUTPUT PIN DC CHARACTERISTICS (NOTE 1) Electrical Specifications: Unless otherwise indicated, VDD = 1.8V to 5.5V, GND = Ground and TA = -20C to +125C. Parameters Input High-level Voltage Low-level Voltage Input Current Input Impedance (A0, A1, A2) Input Impedance (A0, A1, A2) Output (SDA only) Low-level Voltage High-level Current (leakage) Low-level Current Capacitance SDA and SCL Inputs Hysteresis Spike Supression VHYST TSP -- -- -- 0.05VDD 0.1VDD -- -- -- 50 V V ns VDD > 2V VDD < 2V VOL IOH IOL CIN -- -- 6 -- -- -- -- 5 0.4 1 -- -- V A mA pF IOL= 3 mA VOH = VDD VOL = 0.6V VIH VIL IIN ZIN ZIN 0.7VDD -- -- -- -- -- -- -- 1 200 -- 0.3VDD 5 -- -- V V A M k SDA and SCL only VIN > VIH VIN < VIL Sym Min Typ Max Units Conditions Serial Input/Output (SCL, SDA, A0, A1, A2) (Note 2) Note 1: 2: These specifications apply for the Temperature Sensor and EEPROM. For VDD ranges of 1.8V to the temperature sensor VPOR_TS, the temperature sensor becomes partially biased and consumes 80 A (typical) until the sensor POR resets and acknowledges a shutdown command. See Figure 2-15. DS22153B-page 4 (c) 2009 Microchip Technology Inc. MCP98243 SENSOR AND EEPROM SERIAL INTERFACE TIMING SPECIFICATIONS Electrical Specifications: Unless otherwise indicated, GND = Ground, TA = -20C to +125C, and CL = 80 pF (Note 1, 5). VDD= 1.8V to 5.5V VDD= 2.2V to 5.5V Parameters 2-Wire I C Interface Serial port frequency Low Clock High Clock Rise time Fall time Data in Setup time Data in Hold time Data out Hold time Start Condition Setup time Start Condition Hold time Stop Condition Setup time Bus idle Time out (Sensor Only) Bus Capacitive load Note 1: 2: 3: fSCL tLOW tHIGH tR tF tSU:DI tHD:DI tHD:DO tSU:STA tHD:STA tSU:STO tB:FREE tOUT Cb 10 4700 4000 -- 20 250 0 200 4700 4000 4000 4700 -- -- 100 -- -- 1000 300 -- -- 900 -- -- -- -- -- -- 10 1300 600 20 20 100 0 200 600 600 600 1300 25 -- 400 -- -- 300 300 -- -- 900 -- -- -- -- 35 400 kHz ns ns ns ns ns ns ns ns ns ns ns ms pf VDD= 3.0V to 3.6V Note 3 Note 6 Note 4 Note 2, 4 Note 2 Note 2 2 Sym Min Max Min Max Units Conditions 4: 5: 6: All values referred to VIL MAX and VIH MIN levels. If tLOW > tOUT or tHIGH > tOUT, the temperature sensor I2C interface will time out. A Repeat Start command is required for communication. This device can be used in a Standard-mode I2C-bus system, but the requirement tSU:DAT 250 ns must be met. This device does not stretch SCL Low time. It outputs the next data bit to the SDA line within tR MAX + tSU:DI MIN = 1000 ns + 250 ns = 1250 ns (according to the Standard-mode I2C-bus specification) before the SCL line is released. As a transmitter, the device provides internal minimum delay time tHD:DAT MIN to bridge the undefined region (min. 300 ns) of the falling edge of SCL tF MAX to avoid unintended generation of Start or Stop conditions. For VDD ranges of 1.8V to the temperature sensor VPOR_TS, the temperature sensor becomes partially biased and consumes 100 A (typical) until the sensor POR resets and acknowledges a shutdown command. As a receiver, SDA should not be sampled at the falling edge of SCL. SDA can transition tHD:DI 0 ns after SCL toggles Low. (c) 2009 Microchip Technology Inc. DS22153B-page 5 MCP98243 TEMPERATURE CHARACTERISTICS Electrical Specifications: Unless otherwise indicated, VDD = 1.8V to 5.5V for the EEPROM, VDD = 3.0V to 3.6V for the Temperature Sensor, and GND = Ground. Parameters Temperature Ranges Specified Temperature Range Operating Temperature Range Storage Temperature Range Thermal Package Resistances Thermal Resistance, 8L-DFN Thermal Resistance, 8L-TDFN Thermal Resistance, 8L-TSSOP Thermal Resistance, 8L-UDFN Note 1: JA JA JA JA -- -- -- -- 68 52.5 139 41 -- -- -- -- C/W C/W C/W C/W TA TA TA -20 -40 -65 -- -- -- +125 +125 +150 C C C Note 1 Sym Min Typ Max Units Conditions Operation in this range must not cause TJ to exceed Maximum Junction Temperature (+150C). TIMING DIAGRAM U :S T tS O U :D I U :S T tB O :F R EE IG H O W tS tH SD A SC L tO U T tS tH Start Condition D :D I Data Transmission /t H D :D O U :D I tR ,t F tL Stop Condition GRAPHICAL SYMBOL DESCRIPTION Voltage VDD INPUT VIH VIL Voltage VDD VOL IOL Current IIN time Current IOH time OUTPUT DS22153B-page 6 (c) 2009 Microchip Technology Inc. tS MCP98243 2.0 Note: TYPICAL PERFORMANCE CURVES The graphs and tables provided following this note are a statistical summary based on a limited number of samples and are provided for informational purposes only. The performance characteristics listed herein are not tested or guaranteed. In some graphs or tables, the data presented may be outside the specified operating range (e.g., outside specified power supply range) and therefore outside the warranted range. Note: Unless otherwise indicated, VDD = 2.7V to 5.5V, GND = Ground, SDA/SCL pulled-up to VDD, and TA = -40C to +125C. 3.0 Temperature Accuracy (C) VDD= 3.3V 10000 1000 IDD (A) 2.0 1.0 0.0 -1.0 Spec. Limits EEPROM Write (Sensor in Shutdown Mode) 100 10 Sensor (EEPROM Inactive) -2.0 -3.0 -40 -20 0 20 40 60 TA (C) 80 100 120 EEPROM Read (Sensor in Shutdown Mode) 1 -40 -20 0 20 40 60 TA (C) 80 100 120 FIGURE 2-1: Accuracy. 70% 60% Occurrences 50% 40% 30% 20% 10% 0% -1.00 -0.75 -0.50 TA = +95C VDD = 3.3V 221 units Average Temperature FIGURE 2-4: Temperature. Supply Current vs. 35 VDD = 3.3V to 3.6V tOUT (ms) -0.25 0.00 0.25 0.50 0.75 1.00 30 25 -40 -20 0 20 40 60 TA (C) 80 100 120 Temperature Accuracy (C) FIGURE 2-2: Temperature Accuracy Histogram, TA = +95C. 70% 60% Occurrences 50% 40% 30% 20% 10% 0% -1.00 -0.75 -0.50 -0.25 0.00 0.25 0.50 0.75 1.00 TA = +75C VDD = 3.3V 221 units FIGURE 2-5: Temperature. Serial Bus Time-Out vs. 3 2.5 VPOR (V) 2 1.5 1 0.5 0 -40 -20 0 20 40 60 TA (C) 80 100 120 VPOR_EE VPOR_TS Temperature Accuracy (C) FIGURE 2-3: Temperature Accuracy Histogram, TA = +75C. FIGURE 2-6: Power-on Reset Threshold Voltage vs. Temperature. (c) 2009 Microchip Technology Inc. DS22153B-page 7 MCP98243 Note: Unless otherwise indicated, VDD = 2.7V to 5.5V, GND = Ground, SDA/SCL pulled-up to VDD, and TA = -40C to +125C. 0.4 SDA and Event Output (V) IOH = IOL = 3 mA 48 Event (VDD - VOH) 42 SDA IOL (mA) 36 30 24 18 12 6 VOL = 0.6V 0.3 0.2 SDA VOL 0.1 Event VOL 0 -40 -20 0 20 40 60 TA (C) 80 100 120 -40 -20 0 20 40 60 TA (C) 80 100 120 FIGURE 2-7: Temperature. Event and SDA VOL vs. FIGURE 2-10: SDA IOL vs. Temperature. Temperature Accuracy (C) 125 110 tCONV (ms) 95 80 65 50 35 -40 -20 0 20 40 60 TA (C) 80 100 120 3.0 C/VDD = 0.4C/V 2.0 1.0 0.0 -1.0 -2.0 -3.0 -40 VDD = 2.7V VDD = 3.0V VDD = 3.6V VDD = 5.5V -20 0 20 40 60 TA (C) 80 100 120 FIGURE 2-8: Temperature. 1.0 0.5 0.0 -0.5 Conversion Rate vs. FIGURE 2-11: VDD. 120% Thermal Response (%) 100% 80% 60% 40% 20% 0% -2 0 2 Temperature Accuracy vs. Normalized Temp. Error (C) C/VDD, VDD = 3.3V + 150 mVPP (AC) TA = 25C TSSOP-8 DFN-8 22C (Air) to 125C (Oil bath) No decoupling capacitor -1.0 100 100 1k 1k 1,000 10k 10k 10,000 100k 100k 100,000 1,000,000 1M 1M 4 Frequency (Hz) 6 8 Time (s) 10 12 14 16 FIGURE 2-9: Frequency. Power Supply Rejection vs. FIGURE 2-12: Response. Package Thermal DS22153B-page 8 (c) 2009 Microchip Technology Inc. MCP98243 Note: Unless otherwise indicated, VDD = 2.7V to 5.5V, GND = Ground, SDA/SCL pulled-up to VDD, and TA = -40C to +125C. 12 10 8 VHV (V) 6 4 2 0 1.5 2.0 2.5 3.0 3.5 4.0 VDD (V) 4.5 5.0 5.5 Maximum PWP Voltage (VDD + 1V) No SWP/CWP/PWP function within this range VHV applied at A0 pin. See Table 5-4 for Pins A1 and A2 connection 100 80 ISHDN (A) 60 40 20 0 1.5 2.0 VPOR_TS, Sensor in Shutdown Mode Minimum SWP/CWP Voltage TA = -40C TA = +25C TA = +85C TA = +125C 2.5 3.0 3.5 4.0 VDD (V) 4.5 5.0 5.5 FIGURE 2-13: Voltage Range. 3.00 2.50 ISHDN (A) 2.00 1.50 1.00 0.50 0.00 -40 -20 0 SWP/CWP/PWP High FIGURE 2-15: Shutdown Current vs. VDD. 20 40 60 TA (C ) 80 100 120 FIGURE 2-14: Temperature. Shutdown Current vs. (c) 2009 Microchip Technology Inc. DS22153B-page 9 MCP98243 NOTES: DS22153B-page 10 (c) 2009 Microchip Technology Inc. MCP98243 3.0 PIN DESCRIPTION The descriptions of the pins are listed in Table 3-1. TABLE 3-1: PIN FUNCTION TABLES Symbol A0 A1 A2 GND SDA SCL Event VDD EP Description Slave Address and EEPROM Software Write Protect high voltage input (VHV) Slave Address Slave Address Ground Serial Data Line Serial Clock Line Temperature Alert Output Power Pin Exposed Thermal Pad (EP); must be connected to GND. MCP98243 DFN, TDFN, UDFN 1 2 3 4 5 6 7 8 9 TSSOP 1 2 3 4 5 6 7 8 -- 3.1 Address Pins (A0, A1, A2) 3.4 Serial Clock Line (SCL) These pins are device address input pins. The address pins correspond to the Least Significant bits (LSb) of address bits. The Most Significant bits (MSb) (A6, A5, A4, A3). This is shown in Table 3-2. The SCL is a clock input pin. All communication and timing is relative to the signal on this pin. The clock is generated by the host or master controller on the bus. (See Section 4.0 "Serial Communication"). TABLE 3-2: Device MCP98243 ADDRESS BYTE Address Code A6 A5 0 0 1 A4 1 1 1 A3 1 0 0 X X X Slave Address A2 A1 A0 3.5 Temperature Alert, Open-Drain Output (Event) Sensor EEPROM EEPROM Write Protect Note: 0 1 0 The MCP98243 temperature Event output pin is an open-drain output. The device outputs a signal when the ambient temperature goes beyond the user-programmed temperature limit. (see Section 5.2.3 "Event Output Configuration"). User-selectable address is shown by X. 3.6 Power Pin (VDD) The A0 Address pin is a multi-function pin. This input pin is also used for high voltge input VHV to enable the EEPROM Software Write Protect feature, see Section 5.3.3 "Write Protection". All address pin have an internal pull-down resistors. VDD is the power pin. The operating voltage range, as specified in the DC electrical specification table, is applied on this pin. 3.7 Exposed Thermal Pad (EP) 3.2 Ground Pin (GND) The GND pin is the system ground pin. There is an internal electrical connection between the Exposed Thermal Pad (EP) and the GND pin; they can be connected to the same potential on the Printed Circuit Board (PCB). This provides better thermal conduction from the PCB to the die. 3.3 Serial Data Line (SDA) SDA is a bidirectional input/output pin, used to serially transmit data to/from the host controller. This pin requires a pull-up resistor. (See Section 4.0 "Serial Communication"). (c) 2009 Microchip Technology Inc. DS22153B-page 11 MCP98243 NOTES: DS22153B-page 12 (c) 2009 Microchip Technology Inc. MCP98243 4.0 4.1 SERIAL COMMUNICATION 2-Wire Standard Mode I2CTM Protocol-Compatible Interface This device does not support sequential register read/ write. Each register needs to be addressed using the Register Pointer. This device supports the Receive Protocol. The register can be specified using the pointer for the initial read. Each repeated read or receive begins with a Start condition and address byte. The MCP98243 retains the previously selected register. Therefore, it outputs data from the previously-specified register (repeated pointer specification is not necessary). The MCP98243 serial clock input (SCL) and the bidirectional serial data line (SDA) form a 2-wire bidirectional Standard mode I2C compatible communication port (refer to the Input/Output Pin DC Characteristics (Note 1) Table and Sensor And EEPROM Serial Interface Timing Specifications Table). The following bus protocol has been defined: 4.1.2 MASTER/SLAVE TABLE 4-1: Term Master Slave MCP98243 SERIAL BUS PROTOCOL DESCRIPTIONS Description The device that controls the serial bus, typically a microcontroller. The device addressed by the master, such as the MCP98243. Device receiving data from the bus. A unique signal from master to initiate serial interface with a slave. A unique signal from the master to terminate serial interface from a slave. The bus is controlled by a master device (typically a microcontroller) that controls the bus access and generates the Start and Stop conditions. The MCP98243 is a slave device and does not control other devices in the bus. Both master and slave devices can operate as either transmitter or receiver. However, the master device determines which mode is activated. 4.1.3 START/STOP CONDITION Transmitter Device sending data to the bus. Receiver START STOP A high-to-low transition of the SDA line (while SCL is high) is the Start condition. All data transfers must be preceded by a Start condition from the master. A lowto-high transition of the SDA line (while SCL is high) signifies a Stop condition. If a Start or Stop condition is introduced during data transmission, the MCP98243 releases the bus. All data transfers are ended by a Stop condition from the master. Read/Write A read or write to the MCP98243 registers. ACK A receiver Acknowledges (ACK) the reception of each byte by polling the bus. A receiver Not-Acknowledges (NAK) or releases the bus to show End-of-Data (EOD). Communication is not possible because the bus is in use. The bus is in the idle state, both SDA and SCL remain high. SDA must remain stable before SCL becomes high in order for a data bit to be considered valid. During normal data transfers, SDA only changes state while SCL is low. 4.1.4 ADDRESS BYTE NAK Busy Not Busy Data Valid Following the Start condition, the host must transmit an 8-bit address byte to the MCP98243. The address for the MCP98243 Temperature Sensor is `0011,A2,A1,A0' in binary, where the A2, A1 and A0 bits are set externally by connecting the corresponding pins to VDD `1' or GND `0'. The 7-bit address transmitted in the serial bit stream must match the selected address for the MCP98243 to respond with an ACK. Bit 8 in the address byte is a read/write bit. Setting this bit to `1' commands a read operation, while `0' commands a write operation (see Figure 4-1). Address Byte SCL 12 3 4 5 6 7 8 9 A C K 4.1.1 DATA TRANSFER SDA Start 0 0 1 1 A2 A1 A0 Slave Address R/W Data transfers are initiated by a Start condition (START), followed by a 7-bit device address and a read/write bit. An Acknowledge (ACK) from the slave confirms the reception of each byte. Each access must be terminated by a Stop condition (STOP). Repeated communication is initiated after tB-FREE. Address Code MCP98243 Response FIGURE 4-1: Device Addressing. (c) 2009 Microchip Technology Inc. DS22153B-page 13 MCP98243 4.1.5 DATA VALID 4.1.7 After the Start condition, each bit of data in transmission needs to be settled for a time specified by tSU-DATA before SCL toggles from low-to-high (see "Sensor And EEPROM Serial Interface Timing Specifications" on Page 5). TIME OUT (MCP98243, SENSOR ONLY) 4.1.6 ACKNOWLEDGE (ACK/NAK) Each receiving device, when addressed, is obliged to generate an ACK bit after the reception of each byte. The master device must generate an extra clock pulse for ACK to be recognized. The acknowledging device pulls down the SDA line for tSU-DATA before the low-to-high transition of SCL from the master. SDA also needs to remain pulled down for tH-DATA after a high-to-low transition of SCL. During read, the master must signal an End-of-Data (EOD) to the slave by not generating an ACK bit (NAK) once the last bit has been clocked out of the slave. In this case, the slave will leave the data line released to enable the master to generate the Stop condition. If the SCL stays low or high for time specified by tOUT, the MCP98243 temperature sensor resets the serial interface. This dictates the minimum clock speed as specified in the specification. However, the EEPROM does not reset the serial interface. Therefore, the master can hold the clock indefinitely to process data from the EEPROM. DS22153B-page 14 (c) 2009 Microchip Technology Inc. MCP98243 5.0 FUNCTIONAL DESCRIPTION The MCP98243 temperature sensors consists of a band-gap type temperature sensor, a Delta-Sigma Analog-to-Digital Converter ( ADC), user-programmable registers and a 2-wire I2C protocol compatible serial interface. Figure 5-1 shows a block diagram of the register structure. Temperature Sensor Hysteresis Shutdown Critical Trip Lock Alarm Win. Lock Bit Clear Event Event Status Output Control Critical Event only Event Polarity Event Comp/Int Configuration Temperature TUPPER TLOWER TCRIT Manufacturer ID Device ID/Rev Resolution Capability Shutdown Status I2C Bus Time-out Accepts VHV Selected Resolution Temp. Range Accuracy Register Pointer Output Feature 0.5C/bit 0.25C/bit 0.125C/bit 0.0625C/bit Memory Control Logic ADC Band-Gap Temperature Sensor EEPROM HV Generator Write Protected Array (00h-7Fh) Address Decoder X Standard Array (80h-FFh) Write Protect Circuitry Address Decoder Y Sense Amp R/W Control Standard I2C Interface A0 A1 A2 Event SDA SCL VDD GND FIGURE 5-1: Functional Block Diagram. DS22153B-page 15 (c) 2009 Microchip Technology Inc. MCP98243 5.1 Registers The MCP98243 has several registers that are user-accessible. These registers include the Capability register, Configuration register, Event Temperature Upper-Boundary and Lower-Boundary Trip registers, Critical Temperature Trip register, Temperature register, Manufacturer Identification register and Device Identification register. The Temperature register is read-only, used to access the ambient temperature data. The data is loaded in parallel to this register after tCONV. The Event Temperature Upper-Boundary and Lower-Boundary Trip registers are read/writes. If the ambient temperature drifts beyond the user-specified limits, the MCP98243 outputs a signal using the Event pin (refer to Section 5.2.3 "Event Output Configuration"). In addition, the Critical Temperature Trip register is used to provide an additional critical temperature limit. The Capability register is used to provide bits describing the MCP98243's capability in measurement resolution, measurement range and device accuracy. The device Configuration register provides access to configure the MCP98243's various features. These registers are described in further detail in the following sections. The registers are accessed by sending a Register Pointer to the MCP98243 using the serial interface. This is an 8-bit write-only pointer. However, the four Least Significant bits are used as pointers and all unused bits (bits 7-4) need to be cleared or set to `0'. Register 5-1 describes the pointer or the address of each register. REGISTER 5-1: W-0 -- bit 7 Legend: R = Readable bit -n = Value at POR bit 7-4 bit 3-0 REGISTER POINTER (WRITE ONLY) W-0 -- W-0 -- W-0 -- W-0 W-0 W-0 W-0 bit 0 Pointer Bits W = Writable bit `1' = Bit is set U = Unimplemented bit, read as `0' `0' = Bit is cleared x = Bit is unknown Writable Bits: Write `0'' Pointer Bits: 0000 = Capability register 0001 = Configuration register (CONFIG) 0010 = Event Temperature Upper-Boundary Trip register (TUPPER) 0011 = Event Temperature Lower-Boundary Trip register (TLOWER) 0100 = Critical Temperature Trip register (TCRIT) 0101 = Temperature register (TA) 0110 = Manufacturer ID register 0111 = Device ID/Revision register 1000 = Resolution register 1XXX = Reserved (This device has additional registers that are reserved for test and calibration. If these registers are accessed, the device may not perform according to the specification.) DS22153B-page 16 (c) 2009 Microchip Technology Inc. MCP98243 TABLE 5-1: Register Pointer (Hex) 0x00 0x01 0x02 0x03 0x04 0x05 0x06 0x07 MSB/ LSB MSB LSB MSB LSB MSB LSB MSB LSB MSB LSB MSB LSB MSB LSB MSB LSB LSB BIT ASSIGNMENT SUMMARY FOR ALL TEMPERATURE SENSOR REGISTERS (SEE SECTION 5.4) Bit Assignment 7 0 SHDN Status 0 Crt Loc 0 23C 0 23C 0 23C TA TCRIT 23C 0 0 0 0 0 6 0 tOUT Range 0 Win Loc 0 22C 0 22C 0 22C TA > TUPPER 22C 0 1 0 0 0 5 0 VHV 0 Int Clr 0 21C 0 21C 0 21C TA < TLOWER 21C 0 0 1 0 0 4 0 Resolution 0 Evt Stat SIGN 20C SIGN 20C SIGN 20C SIGN 20C 0 1 0 0 0 0 Evt Cnt 27C 2-1C 27C 2-1C 27C 2-1C 27C 2-1C 0 0 0 0 0 3 0 2 0 Range Evt Sel 26C 2-2C 26C 2-2C 26C 2-2C 26C 2-2C 0 1 0 0 0 Hysteresis Evt Pol 25C 0 25C 0 25C 0 25C 2-3C 0 0 0 0 0 1 0 Accuracy 0 0 Event SHDN Evt Mod 24C 0 24C 0 24C 0 24C 2-4C 0 0 1 1 1 0x08 (c) 2009 Microchip Technology Inc. DS22153B-page 17 MCP98243 5.1.1 CAPABILITY REGISTER This is a read-only register used to identify the temperature sensor capability. In this case, the MCP98243 is capable of providing temperature at 0.25C resolution, measuring temperature below and above 0C, providing 1C and 2C accuracy over the active and monitor temperature ranges (respectively) and providing user-programmable temperature event boundary trip limits. Register 5-2 describes the Capability register. These functions are described in further detail in the following sections. REGISTER 5-2: U-0 -- bit 15 R-1 SHDN Status bit 7 Legend: R = Readable bit -n = Value at POR bit 15-8 bit 7 CAPABILITY REGISTER (READ-ONLY) ADDRESS `0000 0000'b U-0 -- U-0 -- U-0 -- U-0 -- U-0 -- U-0 -- U-0 -- bit 8 R-1 R-1 VHV R-0 R-1 R-1 Meas Range R-1 Accuracy R-1 Temp Alarm bit 0 tOUT Range Resolution W = Writable bit `1' = Bit is set U = Unimplemented bit, read as `0' `0' = Bit is cleared x = Bit is unknown Unimplemented: Read as `0' Event output status during Shutdown (SHDN Status): 0 = Event output remains asserted during shutdown 1 = Event output de-asserts during shutdown. After shutdown it takes tCONV to re-assert the Event output (power-up default) I2C Bus time-out (tOUT Range): 0 = Bus time-out range is 10 ms to 60 ms 1 = Bus time-out range is 25 ms to 35 ms (power-up default) High Voltage Input 0 = Pin A0 does not accept High Voltage 1 = Pin A0 accepts High Voltage for the internal EEPROM Write Protect feature (power-up default) Resolution: 00 = 0.5C 01 = 0.25C (power up default) 10 = 0.125C 11 = 0.0625C These bits reflect the selected resolution (see Section 5.2.4 "Temperature Resolution") Temperature Measurement Range (Meas. Range): 0 = TA = 0 (decimal) for temperature below 0C 1 = The part can measure temperature below 0C (power-up default) bit 6 bit 5 bit 4-3 bit 2 DS22153B-page 18 (c) 2009 Microchip Technology Inc. MCP98243 REGISTER 5-2: bit 1 CAPABILITY REGISTER (READ-ONLY) ADDRESS `0000 0000'b (CONTINUED) Accuracy: 0 = Accuracy 2C from +75C to +95C (Active Range) and 3C from +40C to +125C (Monitor Range) 1 = Accuracy 1C from +75C to +95C (Active Range) and 2C from +40C to +125C (Monitor Range) Temperature Alarm: 0 = No defined function (This bit will never be cleared or set to `0') 1 = The part has temperature boundary trip limits (TUPPER/TLOWER/TCRIT registers) and a temperautre event output (JC 42.4 required feature) bit 0 1 2 3 4 5 6 7 8 1 2 3 4 5 6 7 8 SCL A 2 A 1 A 0 A A C K SDA S 0 0 1 1 WC K 0 0 0 0 0 0 0 0 Address Byte MCP98243 1 2 3 4 5 6 7 8 Capability Pointer MCP98243 1 2 3 4 5 6 7 8 1 2 3 4 5 6 7 8 SCL A 2 A 1 A 0 A K A C K N AP K SDA S 0 0 1 1 RC0 0 0 0 0 0 0 0 0 0 0 0 1 1 1 1 Address Byte MCP98243 MSB Data Master LSB Data Master FIGURE 5-2: Timing Diagram for Reading the Capability Register (See Section 4.0 "Serial Communication"). (c) 2009 Microchip Technology Inc. DS22153B-page 19 MCP98243 5.1.2 SENSOR CONFIGURATION REGISTER (CONFIG) The MCP98243 has a 16-bit Configuration register (CONFIG) that allows the user to set various functions for a robust temperature monitoring system. Bits 10 thru 0 are used to select Event output boundary hysteresis, device Shutdown or Low-Power mode, temperature boundary and critical temperature lock, temperature Event output enable/disable. In addition, the user can select the Event output condition (output set for TUPPER and TLOWER temperature boundary or TCRIT only), read Event output status and set Event output polarity and mode (Comparator Output or Interrupt Output mode). The temperature hysteresis bits 10 and 9 can be used to prevent output chatter when the ambient temperature gradually changes beyond the userspecified temperature boundary (see Section 5.2.2 "Temperature Hysteresis (THYST)". The Continuous Conversion or Shutdown mode is selected using bit 8. In Shutdown mode, the band gap temperature sensor circuit stops converting temperature and the Ambient Temperature register (TA) holds the previous successfully converted temperature data (see Section 5.2.1 "Shutdown Mode"). Bits 7 and 6 are used to lock the user-specified boundaries TUPPER, TLOWER and TCRIT to prevent an accidental rewrite. Bits 5 thru 0 are used to configure the temperature Event output pin. All functions are described in Register 5-3 (see Section 5.2.3 "Event Output Configuration"). REGISTER 5-3: U-0 -- bit 15 R/W-0 Crit. Lock bit 7 Legend: R = Readable bit -n = Value at POR bit 15-11 bit 10-9 CONFIGURATION REGISTER (CONFIG) ADDRESS `0000 0001'b U-0 -- U-0 -- U-0 -- U-0 -- R/W-0 THYST R/W-0 R/W-0 SHDN bit 8 R/W-0 Win. Lock R/W-0 Int. Clear R-0 Event Stat. R/W-0 Event Cnt. R/W-0 Event Sel. R/W-0 Event Pol. R/W-0 Event Mod. bit 0 W = Writable bit `1' = Bit is set U = Unimplemented bit, read as `0' `0' = Bit is cleared x = Bit is unknown Unimplemented: Read as `0' TUPPER and TLOWER Limit Hysteresis (THYST): 00 = 0C (power-up default) 01 = 1.5C 10 = 3.0C 11 = 6.0C (Refer to Section 5.2.3 "Event Output Configuration") This bit can not be altered when either of the lock bits are set (bit 6 and bit 7). This bit can be programmed in shutdown mode. bit 8 Shutdown Mode (SHDN): 0 = Continuous Conversion (power-up default) 1 = Shutdown (Low-Power mode) In shutdown, all power-consuming activities are disabled, though all registers can be written to or read. Event output will de-assert. This bit cannot be set `1' when either of the lock bits is set (bit 6 and bit 7). However, it can be cleared `0' for Continuous Conversion while locked (Refer to Section 5.2.1 "Shutdown Mode"). DS22153B-page 20 (c) 2009 Microchip Technology Inc. MCP98243 REGISTER 5-3: bit 7 CONFIGURATION REGISTER (CONFIG) ADDRESS `0000 0001'b TCRIT Lock Bit (Crit. Lock): 0 = Unlocked. TCRIT register can be written. (power-up default) 1 = Locked. TCRIT register can not be written When enabled, this bit remains set `1' or locked until cleared by internal reset (Section 5.4 "Summary of Power-on Default"). This bit does not require a double-write. This bit can be programmed in shutdown mode. bit 6 TUPPER and TLOWER Window Lock Bit (Win. Lock): 0 = Unlocked. TUPPER and TLOWER registers can be written. (power-up default) 1 = Locked. TUPPER and TLOWER registers can not be written When enabled, this bit remains set `1' or locked until cleared by power-on Respell (Section 5.4 "Summary of Power-on Default"). This bit does not require a double-write. This bit can be programmed in shutdown mode. bit 5 Interrupt Clear (Int. Clear) Bit: 0 = No effect (power-up default) 1 = Clear interrupt output. When read this bit returns `0' This bit clears the Interrupt flag which de-asserts Event output. In shutdown mode, the Event output is always de-asserted. Therefore, setting this bit in shutdown mode clears the interrupt after the device returns to normal operation. bit 4 Event Output Status (Event Stat.) Bit: 0 = Event output is not asserted by the device (power-up default) 1 = Event output is asserted as a comparator/Interrupt or critical temperature output In shutdown mode this bit will clear because Event output is always de-asserted in shutdown mode. Event Output Control (Event Cnt.) Bit: 0 = Event output Disabled (power-up default) 1 = Event output Enabled This bit can not be altered when either of the lock bits is set (bit 6 and bit 7). This bit can be programmed in shutdown mode, but Event output will remain de-asserted. bit 3 bit 2 Event Output Select (Event Sel.) Bit: 0 = Event output for TUPPER, TLOWER and TCRIT (power-up default) 1 = TA TCRIT only. (TUPPER and TLOWER temperature boundaries are disabled.) When the Alarm Window Lock bit is set, this bit cannot be altered until unlocked (bit 6). This bit can be programmed in shutdown mode, but Event output will remain de-asserted. bit 1 Event Output Polarity (Event Pol.) Bit: 0 = Active low (power-up default. Pull-up resistor required) See Section 5.2.3 "Event Output Configuration" 1 = Active-high (Pull-down resistor required) See Section 5.2.3 "Event Output Configuration" This bit cannot be altered when either of the lock bits is set (bit 6 and bit 7). This bit can be programmed in shutdown mode, but Event output will remain de-asserted. bit 0 Event Output Mode (Event Mod.) Bit: 0 = Comparator output (power-up default) 1 = Interrupt output This bit cannot be altered when either of the lock bits is set (bit 6 and bit 7). This bit can be programmed in shutdown mode, but Event output will remain de-asserted. (c) 2009 Microchip Technology Inc. DS22153B-page 21 MCP98243 * Writing to the CONFIG Register to Enable the Event Output pin <0000 0000 0000 1000>b. 1 2 3 4 5 6 7 8 1 2 3 4 5 6 7 8 SCL A 2 A 1 A 0 A K A C K SDA S 0 0 1 1 WC 0 0 0 0 0 0 0 1 Address Byte Configuration Pointer MCP98243 MCP98243 1 2 3 4 5 6 7 8 1 2 3 4 5 6 7 8 0 0 0 0 0 0 0 0 A C K 0 0 0 0 1 0 0 0 A C K P MSB Data MCP98243 Note: this is an example routine: i2c_start(); i2c_write(AddressByte & 0xFE); i2c_write(0x01); i2c_write(0x00); i2c_write(0x08); i2c_stop(); LSB Data MCP98243 // send START command //WRITE Command //also, make sure bit 0 is cleared `0' // Write CONFIG Register // Write data // Write data // send STOP command FIGURE 5-3: Timing Diagram for Writing to the Configuration Register (See Section 4.0 "Serial Communication". DS22153B-page 22 (c) 2009 Microchip Technology Inc. MCP98243 * Reading the CONFIG Register. 1 2 3 4 5 6 7 8 1 2 3 4 5 6 7 8 SCL A 2 A 1 A 0 A A C K Note: SDA S 0 0 1 1 WC K 0 0 0 0 0 0 0 1 It is not necessary to select the register pointer if it was set from the previous read/write. Address Byte Configuration Pointer MCP98243 MCP98243 2 3 4 5 6 7 8 1 2 3 4 5 6 7 8 1 2 3 4 5 6 7 8 1 SCL A 2 A 1 A 0 A K A C K N A K SDA S 0 0 1 1 RC 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 0 P Address Byte MCP98243 MSB Data Master LSB Data Master Note: this is an example routine: i2c_start(); i2c_write(AddressByte & 0xFE); i2c_write(0x01); i2c_start(); i2c_write(AddressByte | 0x01); UpperByte = i2c_read(ACK); LowerByte = i2c_read(NAK); i2c_stop(); // send START command //WRITE Command //also, make sure bit 0 is cleared `0' // Write CONFIG Register // send Repeat START command //READ Command //also, make sure bit 0 is set `1' // READ 8 bits //and Send ACK bit // READ 8 bits //and Send NAK bit // send STOP command FIGURE 5-4: Timing Diagram for Reading from the Configuration Register (See Section 4.0 "Serial Communication"). (c) 2009 Microchip Technology Inc. DS22153B-page 23 MCP98243 5.1.3 UPPER/LOWER/CRITICAL TEMPERATURE LIMIT REGISTERS (TUPPER/TLOWER/TCRIT) The MCP98243 has a 16-bit read/write Event output Temperature Upper-Boundary Trip register (TUPPER), a 16-bit Lower-Boundary Trip register (TLOWER) and a 16-bit Critical Boundary Trip register (TCRIT) that contains 11-bit data in two's complement format (0.25 C). This data represents the maximum and minimum temperature boundary or temperature window that can be used to monitor ambient temperature. If this feature is enabled (Section 5.1.2 "Sensor Configuration Register (CONFIG)") and the ambient temperature exceeds the specified boundary or window, the MCP98243 asserts an Event output. (Refer to Section 5.2.3 "Event Output Configuration"). REGISTER 5-4: U-0 -- bit 15 R/W-0 2 bit 7 Legend: R = Readable bit -n = Value at POR bit 15-13 bit 12 3C UPPER/LOWER/CRITICAL TEMPERATURE LIMIT REGISTER (TUPPER/TLOWER/ TCRIT) ADDRESS `0000 0010'b/`0000 0011'b/`0000 0100'b (NOTE 1) U-0 -- U-0 -- R/W-0 Sign R/W-0 27C R/W-0 26C R/W-0 25C R/W-0 24C bit 8 R/W-0 22C R/W-0 21C R/W-0 20C R/W-0 2-1C R/W-0 2-2C U-0 -- U-0 -- bit 0 W = Writable bit `1' = Bit is set U = Unimplemented bit, read as `0' `0' = Bit is cleared x = Bit is unknown Unimplemented: Read as `0' Sign: 0 = TA 0C 1 = TA < 0C TUPPER/TLOWER/TCRIT: Temperature boundary trip data in two's complement format. Unimplemented: Read as `0' bit 11-2 bit 1-0 Note 1: This table shows two 16-bit registers for TUPPER, TLOWER and TCRIT located at `0000 0010b', `0000 0011b' and `0000 0100b', respectively. DS22153B-page 24 (c) 2009 Microchip Technology Inc. MCP98243 * Writing 90C to the TUPPER Register <0000 0101 1010 0000>b. 1 2 3 4 5 6 7 8 1 2 3 4 5 6 7 8 SCL A 2 A 1 A 0 A K A C K SDA S 0 0 1 1 WC 0 0 0 0 0 0 1 0 Address Byte MCP98243 TUPPER Pointer MCP98243 1 2 3 4 5 6 7 8 1 2 3 4 5 6 7 8 0 0 0 0 0 1 0 1 A C K 1 0 1 0 0 0 0 0 A C K P MSB Data MCP98243 LSB Data MCP98243 * Reading from the TUPPER Register. 1 2 3 4 5 6 7 8 1 2 3 4 5 6 7 8 SCL A 2 A 1 A 0 A A C K Note: SDA S 0 0 1 1 WC K 0 0 0 0 0 0 1 0 It is not necessary to select the register pointer if it was set from the previous read/write. Address Byte MCP98243 1 2 3 4 5 6 7 8 TUPPER Pointer MCP98243 1 2 3 4 5 6 7 8 1 2 3 4 5 6 7 8 SCL A 2 A 1 A 0 A K A C K N A K SDA S 0 0 1 1 RC 0 0 0 0 0 1 0 1 1 0 1 0 0 0 0 0 P Address Byte MCP98243 MSB Data Master LSB Data Master FIGURE 5-5: Timing Diagram for Writing and Reading from the TUPPER Register (See Section 4.0 "Serial Communication"). (c) 2009 Microchip Technology Inc. DS22153B-page 25 MCP98243 5.1.4 AMBIENT TEMPERATURE REGISTER (TA) The MCP98243 uses a band gap temperature sensor circuit to output analog voltage proportional to absolute temperature. An internal ADC is used to convert the analog voltage to a digital word. The converter resolution is set to 0.25 C + sign (11-bit data). The digital word is loaded to a 16-bit read-only Ambient Temperature register (TA) that contains 11-bit temperature data in two's complement format. The TA register bits (bits 12 thru 0) are double-buffered. Therefore, the user can access the register while, in the background, the MCP98243 performs an analog-todigital conversion. The temperature data from the ADC is loaded in parallel to the TA register at tCONV refresh rate. In addition, the TA register uses three bits (bits 15, 14 and 13) to reflect the Event pin state. This allows the user to identify the cause of the Event output trigger (see Section 5.2.3 "Event Output Configuration"); bit 15 is set to `1' if TA is greater than or equal to TCRIT, bit 14 is set to `1' if TA is greater than TUPPER and bit 13 is set to `1' if TA is less than TLOWER. The TA register bit assignment and boundary conditions are described in Register 5-5. REGISTER 5-5: R-0 bit 15 R-0 23 C bit 7 Legend: R = Readable bit -n = Value at POR bit 15 AMBIENT TEMPERATURE REGISTER (TA) ADDRESS `0000 0101'b (NOTE 1) R-0 R-0 R-0 SIGN R-0 27 C R-0 26 C R-0 25 C R-0 24 C bit 8 R-0 22 C R-0 21 C R-0 20 C R-0 2-1 C R-0 2-2 C R-0 2-3 C R-0 2-4 C bit 0 TA vs. TCRIT TA vs. TUPPER TA vs. TLOWER W = Writable bit `1' = Bit is set U = Unimplemented bit, read as `0' `0' = Bit is cleared x = Bit is unknown TA vs. TCRIT (1) Bit: 0 = TA < TCRIT 1 = TA TCRIT TA vs. TUPPER (1) Bit: 0 = TA TUPPER 1 = TA > TUPPER TA vs. TLOWER (1) Bit: 0 = TA TLOWER 1 = TA < TLOWER SIGN Bit: 0 = TA 0C 1 = TA < 0C Ambient Temperature (TA) Bits: (Note 2) 12-bit Ambient Temperature data in two's complement format. bit 14 bit 13 bit 12 bit 11-0 Note 1: Bits 15, 14 and 13 are not affected by the status of the Event output configuration (bits 5 to 0 of CONFIG) (Register 5-3). 2: Bits 2, 1, and 0 may remain clear '0' depending on the status of the resolution register (Register 5-8). The Power-up default is 0.25C/bit, bits 1 and 0 remain clear '0'. DS22153B-page 26 (c) 2009 Microchip Technology Inc. MCP98243 5.1.4.1 TA bits to Temperature Conversion EQUATION 5-1: To convert the TA bits to decimal temperature, the upper three boundary bits (bits 15, 14 and 13) must be masked out. Then determine the sign bit (bit 12) to check positive or negative temperature, shift the bits accordingly and combine the upper and lower bytes of the 16-bit register. The upper byte contains data for temperatures greater than 32C while the lower byte contains data for temperature less than 32C, including fractional data. When combinding the upper and lower bytes, the upper byte must be Right-shifted by 4bits (or multiply by 24) and the lower byte must be Left-shifted by 4 bits (or multiply by 2-4). Adding the results of the shifted values provides the temperature data in decimal format, see Equation 5-1. The temperature bits are in two's compliment format, therefore, postive temperature data and negative temperature data are computed differently. Equation 5-1 shows the temperature computation. The example instruction code outlined in Figure 5-6 shows the communication flow, also see Figure 5-7 for timing diagram. This example routine assumes the variables and I2C communication subroutines are predefined: i2c_start(); i2c_write(AddressByte & 0xFE); i2c_write(0x05); i2c_start(); i2c_write(AddressByte | 0x01); UpperByte = i2c_read(ACK); LowerByte = i2c_read(NAK); i2c_stop(); //Convert the temperature data //First Check flag bits if ((UpperByte & 0x80) == 0x80){ } if ((UpperByte & 0x40) == 0x40){ } if ((UpperByte & 0x20) == 0x20){ } UpperByte = UpperByte & 0x1F; if ((UpperByte & 0x10) == 0x10){ UpperByte = UpperByte & 0x0F; }else //Clear flag bits //TA < 0C //Clear SIGN //TA 0C Temperature = (UpperByte x 16 + LowerByte / 16); //Temperature = Ambient Temperature (C) //TA < TLOWER //TA > TUPPER //TA TCRIT // send START command //WRITE Command //also, make sure bit 0 is cleared `0' // Write TA Register Address //Repeat START // READ Command //also, make sure bit 0 is Set `1' // READ 8 bits //and Send ACK bit // READ 8 bits //and Send NAK bit // send STOP command BYTES TO TEMPERATURE CONVERSION 4 -4 Temperature 0C T A = ( UpperByte x 2 + LowerByte x 2 ) Temperature < 0C 4 -4 T A = 256 - ( UpperByte x 2 + LowerByte x 2 ) Where: TA = Ambient Temperature (C) UpperByte = TA bit 15 to bit 8 LowerByte = TA bit 7 to bit 0 Temperature = 256 - (UpperByte x 16 + LowerByte / 16); FIGURE 5-6: Example Instruction Code. (c) 2009 Microchip Technology Inc. DS22153B-page 27 MCP98243 1 2 3 4 5 6 7 8 1 2 3 4 5 6 7 8 SCL A 2 A 1 A 0 A A C K Note: SDA S 0 0 1 1 WC K 0 0 0 0 0 1 0 1 It is not necessary to select the register pointer if it was set from the previous read/write. Address Byte MCP98243 TA Pointer MCP98243 1 2 3 4 5 6 7 8 1 2 3 4 5 6 7 8 1 2 3 4 5 6 7 8 SCL A 2 A 1 A 0 A K A C K N A K SDA S 0 0 1 1 RC 0 0 0 0 0 0 0 1 1 0 0 1 0 1 0 0 P Address Byte MCP98243 MSB Data Master LSB Data Master FIGURE 5-7: Timing Diagram for Reading +25.25C Temperature from the TA Register (See Section 4.0 "Serial Communication"). DS22153B-page 28 (c) 2009 Microchip Technology Inc. MCP98243 5.1.5 MANUFACTURER ID REGISTER This register is used to identify the manufacturer of the device in order to perform manufacturer specific operation. The Manufacturer ID for the MCP98243 is 0x0054 (hexadecimal). REGISTER 5-6: R-0 bit 15 R-0 bit 7 Legend: R = Readable bit -n = Value at POR bit 15-0 . MANUFACTURER ID REGISTER (READ-ONLY) ADDRESS `0000 0110'b R-0 R-0 R-0 R-0 R-0 R-0 R-0 bit 8 R-1 R-0 R-1 R-0 R-1 R-0 R-0 bit 0 Manufacturer ID Manufacturer ID W = Writable bit `1' = Bit is set U = Unimplemented bit, read as `0' `0' = Bit is cleared x = Bit is unknown Device Manufacturer Identification Number 1 2 3 4 5 6 7 8 1 2 3 4 5 6 7 8 SCL A 2 A 1 A 0 A A C K Note: SDA S 0 0 1 1 WC K 0 0 0 0 0 1 1 0 It is not necessary to select the register pointer if it was set from the previous read/write. Address Byte MCP98243 Manuf. ID Pointer MCP98243 1 2 3 4 5 6 7 8 1 2 3 4 5 6 7 8 1 2 3 4 5 6 7 8 SCL A 2 A 1 A 0 A K A C K N A K SDA S 0 0 1 1 RC 0 0 0 0 0 0 0 0 0 1 0 1 0 1 0 0 P Address Byte MCP98243 MSB Data Master LSB Data Master FIGURE 5-8: Timing Diagram for Reading the Manufacturer ID Register (See Section 4.0 "Serial Communication"). (c) 2009 Microchip Technology Inc. DS22153B-page 29 MCP98243 5.1.6 DEVICE ID AND REVISION REGISTER The upper byte of this register is used to specify the device identification and the lower byte is used to specify device revision. The device ID for the MCP98243 is 0x21 (hex). The revision begins with 0x01 (hex) for the first release, with the number being incremented as revised versions are released. REGISTER 5-7: R-0 bit 15 R-0 bit 7 Legend: R = Readable bit -n = Value at POR bit 15-8 bit 7-0 DEVICE ID AND DEVICE REVISION (READ-ONLY) ADDRESS `0000 0111'b R-0 R-1 R-0 Device ID bit 8 R-0 R-0 R-0 R-0 R-0 R-0 R-1 bit 0 R-0 R-0 R-0 R-1 Device Revision W = Writable bit `1' = Bit is set U = Unimplemented bit, read as `0' `0' = Bit is cleared x = Bit is unknown Device ID: Bit 15 to bit 8 are used for device ID Device Revision: Bit 7 to bit 0 are used for device revision 1 2 3 4 5 6 7 8 1 2 3 4 5 6 7 8 SCL A 2 A 1 A 0 A A C K Note: SDA S 0 0 1 1 WC K 0 0 0 0 0 1 1 1 It is not necessary to select the register pointer if it was set from the previous read/write. Address Byte MCP98243 Device ID Pointer MCP98243 1 2 3 4 5 6 7 8 1 2 3 4 5 6 7 8 1 2 3 4 5 6 7 8 SCL A 2 A 1 A 0 A K A C K N A K SDA S 0 0 1 1 RC 0 0 1 0 0 0 0 1 0 0 0 0 0 0 0 1 P Address Byte MCP98243 MSB Data Master LSB Data Master FIGURE 5-9: Timing Diagram for Reading Device ID and Device Revision Register (See Section 4.0 "Serial Communication"). DS22153B-page 30 (c) 2009 Microchip Technology Inc. MCP98243 5.1.7 RESOLUTION REGISTER This register allows the user to change the sensor resolution (see Section 5.2.4 "Temperature Resolution"). The POR default resolution is 0.25C. The selected resolution is also reflected in the Capability register (see Register 5-2). REGISTER 5-8: U-0 -- bit 7 Legend: R = Readable bit -n = Value at POR bit 7-3 bit 2-0 RESOLUTION ADDRESS `0000 1000'b U-0 -- U-0 -- U-0 -- U-0 -- U-0 -- R/W-0 R/W-0 bit 0 Resolution W = Writable bit `1' = Bit is set U = Unimplemented bit, read as `0' `0' = Bit is cleared x = Bit is unknown Unimplemented: Read as `0' Resolution: 00 = LSB = 0.5C (tCONV = 30 ms typical) 01 = LSB = 0.25C (power up default, tCONV = 65 ms typical) 10 = LSB = 0.125C (tCONV = 130 ms typical) 11 = LSB = 0.0625C (tCONV = 260 ms typical) 1 2 3 4 5 6 7 8 1 2 3 4 5 6 7 8 1 2 3 4 5 6 7 8 SCL A 2 A 1 A 0 A K A C K A C K SDA S 0 0 1 1 WC 0 0 0 0 1 0 0 0 0 0 0 0 0 0 1 1 P Address Byte Resolution Pointer MCP98243 MCP98243 Data MCP98243 FIGURE 5-10: Timing Diagram for Changing TA Resolution to 0.0625C <0000 0011>b (See Section 4.0 "Serial Communication"). (c) 2009 Microchip Technology Inc. DS22153B-page 31 MCP98243 5.2 5.2.1 SENSOR FEATURE DESCRIPTION SHUTDOWN MODE Shutdown mode disables all power-consuming activities (including temperature sampling operations) while leaving the serial interface active. This mode is selected by setting bit 8 of CONFIG to `1'. In this mode, the device consumes ISHDN. It remains in this mode until bit 8 is cleared `0' to enable Continuous Conversion mode, or until power is recycled. The Shutdown bit (bit 8) cannot be set to `1' while bits 6 and 7 of CONFIG (Lock bits) are set to `1'. However, it can be cleared `0' or returned to Continuous Conversion while locked. In Shutdown mode, all registers can be read or written. However, the serial bus activity increases the shutdown current. If the device is shutdown while the Event pin is asserted, then the Event output will be de-asserted during shutdown. It will remain de-asserted until the device is enabled for normal operation. Once the device is enabled it takes tCONV before the device re-asserts the Event output. When the ambient temperature increases above the critical temperature limit, the Event output is forced to a comparator output (regardless of bit 0 of CONFIG). When the temperature drifts below the critical temperature limit minus hysteresis, the Event output automatically returns to the state specified by bit 0 of CONFIG. MCP98243 VDD Event Output RPD FIGURE 5-11: Configuration. VDD Active-High Event Output MCP98243 5.2.2 TEMPERATURE HYSTERESIS (THYST) RPU Event Output A hysteresis of 0C, 1.5C, 3C or 6C can be selected for the TUPPER, TLOWER and TCRIT temperate boundaries using bits 10 and 9 of CONFIG. The hysteresis applies for decreasing temperature only (hot to cold), or as temperature drifts below the specified limit. The hysteresis bits can not be changed if either of the lock bits, bits 6 and 7 of CONFIG, are set to `1'. The TUPPER, TLOWER and TCRIT boundary conditions are described graphically in Figure 5-2. FIGURE 5-12: Configuration. Active-Low Event Output The status of the Event output can be read using bit 4 of CONFIG (Event status). This bit can not be set to `1' in shutdown mode. Bit 7 and 6 of the CONFIG register can be used to lock the TUPPER, TLOWER and TCRIT registers. The bits prevent false triggers at the Event output due to an accidental rewrite to these registers. The Event output can also be used as a critical temperature output using bit 2 of CONFIG (critical output only). When this feature is selected, the Event output becomes a comparator output. In this mode, the interrupt output configuration (bit 0 of CONFIG) is ignored. 5.2.3 EVENT OUTPUT CONFIGURATION The Event output can be enabled using bit 3 of CONFIG (Event output control bit) and can be configured as either a comparator output or as Interrupt Output mode using bit 0 of CONFIG (Event mode). The polarity can also be specified as an active-high or active-low using bit 1 of CONFIG (Event polarity). When active-high output is selected, a pull-down resistor is requried on the Event pin. When active-low output is selected, a pull-up resistor is required on the Event pin, see Figure 5-11 and Figure 5-12 for graphical circuit description. These configurations are designed to serve processors with Low-to-High or High-to-Low edge triggered inputs. With these configurations, when the Event output De-asserts, power will not be dissipated across the pull-up or pull-down resistors. DS22153B-page 32 (c) 2009 Microchip Technology Inc. MCP98243 5.2.3.1 Comparator Mode 5.2.4 TEMPERATURE RESOLUTION Comparator mode is selected using bit 0 of CONFIG. In this mode, the Event output is asserted as active-high or active-low using bit 1 of CONFIG. Figure 5-13 shows the conditions that toggle the Event output. If the device enters Shutdown mode with asserted Event output, the output will de-assert. It will remain deasserted until the device enters Continuous Conversion mode and after the first temperature conversion is completed, tCONV. After the initial temperature conversion, TA must satisfy the TUPPER or TLOWER boundary conditions in order for Event output to be asserted. Comparator mode is useful for thermostat-type applications, such as turning on a cooling fan or triggering a system shutdown when the temperature exceeds a safe operating range. The MCP98243 is capable of providing a temperature data with 0.5C to 0.0625C resolution. The Resolution can selected using the Resolution register (Register 58) which is located in address `00001000'b. This address location is not specified in JEDEC Standard JC42.4. However, it provides additional flexibility while being functionally compatible with JC42.4 and provide a 0.25C resolution at 125 ms (max.). The selected resolution can be read by user using bit 4 and bit 3 of the Capability register (Register 5-2). A 0.25C resolution is set as POR default by factory. TABLE 5-2: Resolution 0.5C TEMPERATURE CONVERSION TIME tCONV (ms) 30 65 130 260 Samples/sec (typical) 33 15 8 4 5.2.3.2 Interrupt Mode In the Interrupt mode, the Event output is asserted as active-high or active-low (depending on the polarity configuration) when TA drifts above or below TUPPER and TLOWER limits. The output is deasserted by setting bit 5 (Interrupt Clear) of CONFIG. If the device enters Shutdown mode with asserted Event output, the output will de-assert. It will remain de-asserted until the device enters Continuous Conversion mode and after the first temperature conversion is completed, tCONV. After the initial temperature conversion, TA must cross the TUPPER or TLOWER boundary conditions in order for Event output to be asserted. In addition, if TA >= TCRIT the Event output is forced as Comparator mode and asserts until TA < TCRIT - THYST. While the Event output is asserted, user must send Clear Interrupt command (bit 5 of CONFIG) for Event output to de-assert, when temperature drops below the critical limit, TA < TCRIT - THYST. Otherwise, Event output remains asserted (see Figure 5-13 for graphical description). Switching from Interrupt mode to Comparator mode also de-asserts Event output. This mode is designed for interrupt driven microcontroller based systems. The microcontroller receiving the interrupt will have to acknowledge the interrupt by setting bit 5 of CONFIG register from the MCP98243. 0.25C (Power-up default) 0.125C 0.0625C (c) 2009 Microchip Technology Inc. DS22153B-page 33 MCP98243 TCRIT - THYST TCRIT TUPPER TA TLOWER TLOWER -THYST Comparator Event Output (Active-Low) TUPPER - THYST TUPPER - THYST TLOWER - THYST Interrupt S/w Int. Clear Critical Only Comparator Event Output (Active-High) Interrupt S/w Int. Clear Critical Only Note: 1 2 13 4 35 6 74 2 TABLE 5-9: Note 1 2 3 4 5 6 Event Output Boundary Conditions TA TLOWER TA < TLOWER - THYST TA > TUPPER TA TUPPER - THYST TA TCRIT Event Output (Active Low/High) Comparator Hi/Lo Lo/Hi Lo/Hi Hi/Lo Lo/Hi Interrupt Lo/Hi Lo/Hi Lo/Hi Lo/Hi Lo/Hi Critical Hi/Lo Hi/Lo Hi/Lo Hi/Lo Lo/Hi 15 0 0 0 0 1 TA Bits 14 0 0 1 0 1 13 0 1 0 0 0 When TA TCRIT the Event output is forced to Comparator Mode and bits 0 of CONFIG (Event output mode) is ignored until TA < TCRIT - THYST. In the Interrupt Mode, if Interrupt is not cleared (bits 5 of CONFIG) as shown in the diagram at Note 6, then Event will remain asserted at Note 7 until Interrupt is cleared by user. TA < TCRIT - THYST Lo/Hi Hi/Lo Hi/Lo 0 1 0 7 FIGURE 5-13: Event Output Condition. DS22153B-page 34 (c) 2009 Microchip Technology Inc. MCP98243 5.3 5.3.1 EEPROM FEATURE DESCRIPTION BYTE WRITE To write a byte in the MCP98243 EEPROM, the master has to specify the memory location or address. Once the address byte is transmitted correctly followed by a word address, the word address is stored in the EEPROM address pointer. The following byte is data to be stored in the specified memory location. Figure 514 shows the timing diagram. 1 2 3 4 5 6 7 8 1 2 3 4 5 6 7 8 1 2 3 4 5 6 7 8 SCL A 2 A 1 A 0 A K A C K A C K SDA S 1 0 1 0 WC X X X X X X X X X X X X X X X X P Address Byte MCP98243 Word Address MCP98243 Data MCP98243 FIGURE 5-14: Timing Diagram for Byte Write (See Section 4.0 "Serial Communication"). (c) 2009 Microchip Technology Inc. DS22153B-page 35 MCP98243 5.3.2 PAGE WRITE The write Address Byte, word address and the first data byte are transmitted to the MCP98243 in the same way as in a byte write. Instead of generating a Stop condition, the master transmits up to 15 additional data bytes to the MCP98243, which are temporarily stored in the on-chip page buffer and will be written into the memory after the master has transmitted a Stop condition. Upon receipt of each word, the four lower order address pointer bits are internally incremented by one. The higher order four bits of the word address remain constant. If the master should transmit more than 16 bytes prior to generating the Stop condition, the address counter will roll over and the previously received data will be overwritten. As with the byte write operation, once the Stop condition is received, an internal write cycle will begin (Figure 5-15). Note: Page write operations are limited to writing bytes within a single physical page, regardless of the number of bytes actually being written. Physical page boundaries start at addresses that are integer multiples of the page buffer size (or `page size') and end at addresses that are integer multiples of [page size - 1]. If a Page Write command attempts to write across a physical page boundary, the result is that the data wraps around to the beginning of the current page (overwriting data previously stored there), instead of being written to the next page, as might be expected. It is therefore necessary for the application software to prevent page write operations that would attempt to cross a page boundary. 1 2 3 4 5 6 7 8 1 2 3 4 5 6 7 8 SCL A 2 A 1 A 0 A K A C K SDA S 1 0 1 0 WC X X X X X X X X Address Byte MCP98243 Word Address (n) MCP98243 1 2 3 4 5 6 7 8 1 2 3 4 5 6 7 8 X X X X X X X X A C K X X X X X X X X A C K X X X X X X A C K P Data at (n) MCP98243 Note: Data at (n+1) MCP98243 Data at (n+15) MCP98243 n is the initial address for a page. FIGURE 5-15: Timing Diagram for Page Write (See Section 4.0 "Serial Communication"). DS22153B-page 36 (c) 2009 Microchip Technology Inc. MCP98243 5.3.3 WRITE PROTECTION The MCP98243 has a Software Write-Protect (SWP) feature that allows the lower half array (addresses 00h - 7Fh) to be write-protected or permanently writeprotected (PWP). The write protected area can be cleared by sending Clear Write Protect (CWP) command. However, once the PWP is executed the protected memory can not be cleared. The device will not respond to the CWP command. To access write protection, the device address code of the Address Byte is set to `0110' instead of `1010'. The `1010' Address code is used to access the memory area and the `0110' address code is used to access the write protection. Once the device is write protected it will not acknowledge certain commands. Table 5-3 shows the corresponding Address Bytes for the write protect feature. TABLE 5-3: EEPROM WRITE PROTECT DEVICE ADDRESSING Address Pins Operation A2 A1 A0 VHV VHV X (NOTE 1) Address Byte Address Code 0110 0110 0110 Slave Address A2 0 0 X A1 0 1 X A0 1 1 X R/W 0 1 0 1 0 1 SWP CWP PWP (Note) Note 1: WRITE READ WRITE READ WRITE READ GND GND GND X VDD X The Address Pins are `X' or don't cares. However, the slave address bits need to match the address pins. For VHV voltage levels, refer to Figure 2-13. TABLE 5-4: Status Not Protected Protected with SWP DEVICE RESPONSE WHEN WRITING DATA OR ACCESSING SWP/CWP/PWP (NOTE 1) Command SWP/CWP/PWP Page/byte write SWP CWP PWP Page/byte write lower 128 bytes SWP/CWP/PWP Page/byte write lower 128 bytes ACK ACK ACK NoACK ACK ACK ACK NoACK ACK Address X Address X X X Address X Address ACK ACK ACK NoACK ACK ACK ACK NoACK ACK Data Byte X Data X X X Data X Data ACK ACK ACK NoACK ACK ACK NoACK NoACK NoACK Write Cycle Yes Yes No Yes Yes No No No Permanently Protected Note 1: X is defined as `don't care'. (c) 2009 Microchip Technology Inc. DS22153B-page 37 MCP98243 5.3.3.1 Software Write Protect (SWP) The SWP feature is invoked by writing to the writeprotect register. This is done by sending an Address Byte similar to a normal Write command. Figure 5-18 shows the timing diagram. SWP can be cleared using the CWP command. See Section 5.3.3.2 "Clear Write Protect (CWP)" The Slave Address bits need to correspond to the address pin logic configuration. For SWP, a high voltage VHV needs to be applied to the A0 pin and the corresponding slave address needs to be set to `1', as shown in Table 5-3. Both A2 and A1 pins are grounded and the corresponding slave address bits are set to `0'. The device response in this mode is shown in Table 54 and Table 5-5. 3 4 5 6 7 8 1 2 3 4 5 6 7 8 1 2 3 4 5 6 7 8 1 2 SCL A C K A C K A C K SDA S 0 1 1 0 0 0 1W X X X X X X X X X X X X X X X X P Address Byte MCP98243 Note: Word Address MCP98243 Data MCP98243 Apply VHV at A0 pin and connect GND to A1 and A2 pins to initiate SWP cycle. FIGURE 5-16: Timing Diagram for Setting Software Write Protect (See Section 4.0 "Serial Communication"). 5.3.3.2 Clear Write Protect (CWP) The Slave Address bits need to correspond to the address pin logic configuration. For CWP, a high voltage VHV needs to be applied to the A0 pin and the corresponding slave address needs to be set to `1'. The A1 pin is set to VDD and the corresponding slave address bit is set to `1'. And A2 pins is set to ground and the corresponding slave address bits are set to `0'. Table 5-3 shows the bit configuration. The device response in this mode is shown in Table 5-4 and Table 5-5. 3 4 5 6 7 8 1 2 3 4 5 6 7 8 The CWP feature is invoked by writing to the clear write-protect register. This is done by sending an Address Byte similar to a normal Write command. Figure 5-18 shows the timing diagram. CWP clears SWP only. PWP can not be cleared using this command. 1 2 3 4 5 6 7 8 1 2 SCL A C K A C K A C K SDA S 0 1 1 0 0 1 1W X X X X X X X X X X X X X X X X P Address Byte MCP98243 Note: Word Address MCP98243 Data MCP98243 Apply VHV at A0 pin, apply VDD at A1 pin, connect A2 pin to GND to initiate CWP cycle. FIGURE 5-17: Timing Diagram for Setting Clear Write Protect (See Section 4.0 "Serial Communication"). DS22153B-page 38 (c) 2009 Microchip Technology Inc. MCP98243 5.3.3.3 PWP (Permanent Write Protect) Once the PWP register is written, the lower half of the memory will be permanent protected and the device will not acknowledge any command. The protected area of the memory can not be cleared, reversed, or rewritten. If a write is attempted to the protected area, the device will acknowledge the address byte and word address but not the data byte. (See Table 5-4 and Table 5-5). Note: Once the Permanent Write-Protect is executed, it cannot be reversed, even if the device power is cycled. See Figure 2-13 for VHV voltage levels. Unlike SWP and CWP, a VHV is not applied on the A0 pin to execute PWP. The state of A2, A1, and A0 is user selectable. However, the address pin states need to match the slave address bits, as shown in Table 5-3. 1 2 3 4 5 6 7 8 1 2 3 4 5 6 7 8 1 2 3 4 5 6 7 8 SCL A 2 A 1 A 0 A K A C K A C K SDA S 0 1 1 0 WC X X X X X X X X X X X X X X X X P Address Byte MCP98243 Note: Word Address MCP98243 Data MCP98243 Unlike SWP and CWP, VHV must be within the range of GND to VDD + 1V to execute PWP. See Figure 2-13 and Section 5.3.3 "Write Protection". FIGURE 5-18: Timing Diagram for Setting Permanent Write Protect (See Section 4.0 "Serial Communication"). (c) 2009 Microchip Technology Inc. DS22153B-page 39 MCP98243 5.3.4 READ OPERATION Read operations are initiated in the same way as write operations, with the exception that the R/W bit of the slave address is set to `1'. There are three basic types of read operations: current address read, random read and sequential read. TABLE 5-5: Status DEVICE RESPONSE WHEN READING SWP/CWP/PWP (NOTE) Command SWP/CWP/PWP SWP CWP PWP SWP/CWP/PWP ACK ACK NoACK ACK ACK NoACK Address X X X X X ACK NoACK NoACK NoACK NoACK NoACK Data Byte X X X X X ACK NoACK NoACK NoACK NoACK NoACK Not Protected Protected with SWP Permanently Protected Note: X is defined as `don't care'. 5.3.4.1 Current Address Read The MCP98243 contains an address counter that maintains the address of the last word accessed, internally incremented by `1'. Therefore, if the previous access (either a read or write operation) was to address n, the next current address read operation would access data from address n+1. Upon receipt of the slave address with R/W bit set to `1', the MCP98243 issues an acknowledge and transmits the 8-bit data 1 2 3 4 5 6 7 8 word. The master will not acknowledge (NAK) the transfer but does generate a Stop condition and the MCP98243 discontinues transmission (Figure 5-19). 1 2 3 4 5 6 7 8 SCL A 2 A 1 A 0 A K N A K SDA S 1 0 1 0 RC 0 0 0 0 0 0 0 0 P Address Byte Current Word Address MCP98243 Master Note: In this example, the current word address is the previously accessed address location n plus 1. FIGURE 5-19: Reading Current Word Address (See Section 4.0 "Serial Communication"). DS22153B-page 40 (c) 2009 Microchip Technology Inc. MCP98243 5.3.4.2 Random Read Random read operations allow the master to access any memory location in a random manner. To perform this type of read operation, the word address must first be set. This is done by sending the word address to the MCP98243 as part of a write operation. Once the word address is sent, the master generates a start condition following the acknowledge. This terminates the write operation, but not before the internal address pointer is set. The master then issues the Address Byte again, but with the R/W bit set to a `1'. The MCP98243 then issues an acknowledge and transmits the 8-bit data word. The master will not acknowledge the transfer but does generate a stop condition and the MCP98243 discontinues transmission (Figure 5-20). 1 2 3 4 5 6 7 8 1 2 3 4 5 6 7 8 SCL A 2 A 1 A 0 A A C K SDA S 1 0 1 0 WC K 0 0 0 0 0 0 0 0 Address Byte MCP98243 Word Address (n) MCP98243 1 2 3 4 5 6 7 8 1 2 3 4 5 6 7 8 SCL A 2 A 1 A 0 A K N A K SDA S 1 0 1 0 RC X X X X X X X X P Address Byte MCP98243 Data at (n) Master Note: In this example, `n' is the current Address Word which `00'h and the data is the byte at address `n'. FIGURE 5-20: Timing Diagram for Random Read (See Section 4.0 "Serial Communication"). (c) 2009 Microchip Technology Inc. DS22153B-page 41 MCP98243 5.3.4.3 Sequential Read Sequential reads are initiated in the same way as a random read, with the exception that after the MCP98243 transmits the first data byte, the master issues an acknowledge, as opposed to a stop condition in a random read. This directs the MCP98243 to transmit the next sequentially addressed 8-bit word (Figure 5-21). To provide sequential reads, the MCP98243 contains an internal address pointer, which is incremented by one at the completion of each operation. This address pointer allows the entire memory contents to be serially read during one operation. 1 2 3 4 5 6 7 8 1 2 3 4 5 6 7 8 SCL A 2 A 1 A 0 A C K A C K SDA S 1 0 1 0 R X X X X X X X X Address Byte MCP98243 Data (n)1 MCP98243 1 2 3 4 5 6 7 8 1 2 3 4 5 6 7 8 X X X X X X X X A C K X X X X X X X X A C K X X X X X X N A K P Data at (n+1) MCP98243 Data at (n+2) MCP98243 Data at (n+m)(1) Master Note 1: `n' is the initial address location and `m' is the final address location (`n+m' < 256) FIGURE 5-21: 5.3.5 Timing Diagram for Sequential Read (See Section 4.0 "Serial Communication"). STANDBY MODE The design will incorporate a low power standby mode (ISHDN). Standby mode will be entered after a normal termination of any operation and after all internal functions are complete. This would include any error conditions occurring, such as improper number of clock cycles or improper instruction byte as defined previously. DS22153B-page 42 (c) 2009 Microchip Technology Inc. MCP98243 5.4 Summary of Power-on Default The MCP98243 has an internal Power-on Reset (POR) circuit. If the power supply voltage VDD glitches down to the VPOR_TS and VPOR_EE thresholds, the device resets the registers to the power-on default settings. Table 5-6 shows the power-on default summary for the temperature sensor. The EEPROM resets the address pointer to 0x00 hex. TABLE 5-6: POWER-ON RESET DEFAULTS Registers Register Name Capability Default Register Data (Hexadecimal) 0x00EF Power-up Default Register Description Event output de-asserts in shutdown I2C time out 25 ms to 35 ms. Accepts VHV at A0 Pin 0.25C Measurement Resolution Measures temperature below 0C 1C accuracy over active range Temperature event output Comparator mode Active-Low output Event and critical output Output disabled Event not asserted Interrupt cleared Event limits unlocked Critical limit unlocked Continuous conversion 0C Hysteresis 0C 0C 0C 0C 0x0054 (hex) 0x2101 (hex) 0x01 (hex) Address (Hexadecimal) 0x00 0x01 CONFIG 0x0000 0x02 0x03 0x04 0x05 0x06 0x07 0x08 TUPPER TLOWER TCRIT TA Manufacturer ID Device ID/ Device Revision Resolution 0x0000 0x0000 0x0000 0x0000 0x0054 0x2101 0x01 (c) 2009 Microchip Technology Inc. DS22153B-page 43 MCP98243 NOTES: DS22153B-page 44 (c) 2009 Microchip Technology Inc. MCP98243 6.0 6.1 APPLICATIONS INFORMATION Layout Considerations 6.2 Thermal Considerations The MCP98243 does not require any additional components besides the master controller in order to measure temperature. However, it is recommended that a decoupling capacitor of 0.1 F to 1 F be used between the VDD and GND pins. A high-frequency ceramic capacitor is recommended. It is necessary for the capacitor to be located as close as possible to the power and ground pins of the device in order to provide effective noise protection. In addition, good PCB layout is key for better thermal conduction from the PCB temperature to the sensor die. For good temperature sensitivity, add a ground layer under the device pins as shown in Figure 6-1. A potential for self-heating errors can exist if the MCP98243 SDA, SCLK and Event lines are heavily loaded with pull-ups (high current). Typically, the selfheating error is negligible because of the relatively small current consumption of the MCP98243. A temperature accuracy error of approximately 0.5C could result from self-heating if the communication pins sink/source the maximum current specified. For example, if the Event output is loaded to maximum IOL, Equation 6-1 can be used to determine the effect of self-heating. EQUATION 6-1: EFFECT OF SELFHEATING T = JA ( V DD * I DD + V OL_Event * I OL_Event + V OL_SDA * I OL_SDA ) Where: T = TJ - TA TJ = Junction Temperature TA = Ambient Temperature JA = Package Thermal Resistance VOL_Event, SDA = Event and SDA Output VOL (0.4 Vmax) IOL_Event, SDA = Event and SDA Output IOL (3 mAmax) At room temperature (TA = +25C) with maximum IDD = 500 A and VDD = 3.6V, the self-heating due to power dissipation T is 0.2C for the DFN-8 package and 0.5C for the TSSOP-8 package. A0 A1 EP9 A2 GND VDD Event SCL SDA FIGURE 6-1: DFN Package Layout. (c) 2009 Microchip Technology Inc. DS22153B-page 45 MCP98243 NOTES: DS22153B-page 46 (c) 2009 Microchip Technology Inc. MCP98243 7.0 7.1 PACKAGING INFORMATION Package Marking Information 8-Lead 2x3x0.9 DFN Example: XXX YWW NN ABZ 934 25 8-Lead 2x3x0.75 TDFN Example: XXX YWW NN AAG 934 25 8-Lead 2x3x0.5 UDFN Example: XXX YWW NN AAA 934 25 8-Lead TSSOP XXXX XYWW NNN Example: 243B E934 256 Legend: XX...X Y YY WW NNN e3 * Note: Customer-specific information Year code (last digit of calendar year) Year code (last 2 digits of calendar year) Week code (week of January 1 is week `01') Alphanumeric traceability code Pb-free JEDEC designator for Matte Tin (Sn) This package is Pb-free. The Pb-free JEDEC designator ( e3 ) can be found on the outer packaging for this package. In the event the full Microchip part number cannot be marked on one line, it will be carried over to the next line, thus limiting the number of available characters for customer-specific information. (c) 2009 Microchip Technology Inc. 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DS22153B-page 51 MCP98243 /HDG 3ODVWLF 'XDO )ODW 1R /HDG 3DFNDJH 08 [ [ 1RWH PP %RG\ >8')1@ )RU WKH PRVW FXUUHQW SDFNDJH GUDZLQJV SOHDVH VHH WKH 0LFURFKLS 3DFNDJLQJ 6SHFLILFDWLRQ ORFDWHG DW KWWS ZZZ PLFURFKLS FRP SDFNDJLQJ DS22153B-page 52 (c) 2009 Microchip Technology Inc. MCP98243 /HDG 3ODVWLF 'XDO )ODW 1R /HDG 3DFNDJH 08 [ [ 1RWH PP %RG\ >8')1@ )RU WKH PRVW FXUUHQW SDFNDJH GUDZLQJV SOHDVH VHH WKH 0LFURFKLS 3DFNDJLQJ 6SHFLILFDWLRQ ORFDWHG DW KWWS ZZZ PLFURFKLS FRP SDFNDJLQJ (c) 2009 Microchip Technology Inc. DS22153B-page 53 MCP98243 /HDG 3ODVWLF 7KLQ 6KULQN 6PDOO 2XWOLQH 67 1RWH PP %RG\ >76623@ )RU WKH PRVW FXUUHQW SDFNDJH GUDZLQJV SOHDVH VHH WKH 0LFURFKLS 3DFNDJLQJ 6SHFLILFDWLRQ ORFDWHG DW KWWS ZZZ PLFURFKLS FRP SDFNDJLQJ D N E E1 NOTE 1 1 b 2 e c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page 54 (c) 2009 Microchip Technology Inc. MCP98243 Note: For the most current package drawings, please see the Microchip Packaging Specification located at http://www.microchip.com/packaging (c) 2009 Microchip Technology Inc. DS22153B-page 55 MCP98243 NOTES: DS22153B-page 56 (c) 2009 Microchip Technology Inc. MCP98243 APPENDIX A: REVISION HISTORY Revision B (October 2009) The following is the list of modifications: Added MCP98243 vs MCP98242 comparison table. 2. Added EEPROM Write temperature Range. 3. Changed I2C time out minimum specification to 25 ms. 4. Replaced Figure 2-5. 5. Updated bits 7 and 6 of Register 5-2: Capability Register. 6. Updated Device/Revision ID register. 7. Updated Functional Block Diagram (Figure 5-1). 8. Updated Section 5.2.3.1 "Comparator Mode" and Section 5.2.3.2 "Interrupt Mode". 9. Updated Figure 5-13. 10. Updated package marking drawings. 1. Revision A (May 2009) * Original Release of this Document. (c) 2009 Microchip Technology Inc. DS22153B-page 57 MCP98243 NOTES: DS22153B-page 58 (c) 2009 Microchip Technology Inc. MCP98243 PRODUCT IDENTIFICATION SYSTEM To order or obtain information, e.g., on pricing or delivery, refer to the factory or the listed sales office. PART NO. Device -X Grade X Temperature Range /XXX Package Examples: a) b) MCP98243-BE/MC: Extended Temp., 8LD DFN pkg. MCP98243T-BE/MC: Tape and Reel, Extended Temp., 8LD DFN pkg. Device: MCP98243: Digital Temperature Sensor MCP98243T: Digital Temperature Sensor (Tape and Reel) B B B E = 1C (max.) from +75C to +95C, 2C (max.) from +40C to +125C, and 3C (max.) from -20C to +125C = -40C to +125C a) b) MCP98243-BE/ST: Extended Temp., 8LD TSSOP pkg. MCP98243T-BE/ST: Tape and Reel, Extended Temp., 8LD TSSOP pkg. Grade: Temperature Range: Package: a) MC = Dual Flat No Lead (2x3x0.9 mm Body), 8-lead, MNY * = Dual Flat No Lead (2x3x0.75 mm Body, 8-lead (Tape and Reel) MUY * = Dual Flat No Lead (2x3x0.5 mm Body, 8-lead (Tape and Reel) ST = Plastic Thin Shrink Small Outline (4x4 mm Body), 8-lead * Y = nickel palladium gold manufacturing designator. Only available on the TDFN and UDFN packages. MCP98243T-BE/MNY:Tape and Reel, Extended Temp., 8LD TDFN (nickel palladium gold) pkg. MCP98243T-BE/MUY:Tape and Reel. Extended Temp., 8LD UDFN (nickel palladium gold) pkg. a) (c) 2009 Microchip Technology Inc. DS22153B-page 59 MCP98243 NOTES: DS22153B-page 60 (c) 2009 Microchip Technology Inc. Note the following details of the code protection feature on Microchip devices: * * * Microchip products meet the specification contained in their particular Microchip Data Sheet. Microchip believes that its family of products is one of the most secure families of its kind on the market today, when used in the intended manner and under normal conditions. There are dishonest and possibly illegal methods used to breach the code protection feature. All of these methods, to our knowledge, require using the Microchip products in a manner outside the operating specifications contained in Microchip's Data Sheets. Most likely, the person doing so is engaged in theft of intellectual property. Microchip is willing to work with the customer who is concerned about the integrity of their code. Neither Microchip nor any other semiconductor manufacturer can guarantee the security of their code. Code protection does not mean that we are guaranteeing the product as "unbreakable." * * Code protection is constantly evolving. We at Microchip are committed to continuously improving the code protection features of our products. Attempts to break Microchip's code protection feature may be a violation of the Digital Millennium Copyright Act. If such acts allow unauthorized access to your software or other copyrighted work, you may have a right to sue for relief under that Act. Information contained in this publication regarding device applications and the like is provided only for your convenience and may be superseded by updates. It is your responsibility to ensure that your application meets with your specifications. MICROCHIP MAKES NO REPRESENTATIONS OR WARRANTIES OF ANY KIND WHETHER EXPRESS OR IMPLIED, WRITTEN OR ORAL, STATUTORY OR OTHERWISE, RELATED TO THE INFORMATION, INCLUDING BUT NOT LIMITED TO ITS CONDITION, QUALITY, PERFORMANCE, MERCHANTABILITY OR FITNESS FOR PURPOSE. Microchip disclaims all liability arising from this information and its use. Use of Microchip devices in life support and/or safety applications is entirely at the buyer's risk, and the buyer agrees to defend, indemnify and hold harmless Microchip from any and all damages, claims, suits, or expenses resulting from such use. No licenses are conveyed, implicitly or otherwise, under any Microchip intellectual property rights. Trademarks The Microchip name and logo, the Microchip logo, dsPIC, KEELOQ, KEELOQ logo, MPLAB, PIC, PICmicro, PICSTART, rfPIC and UNI/O are registered trademarks of Microchip Technology Incorporated in the U.S.A. and other countries. FilterLab, Hampshire, HI-TECH C, Linear Active Thermistor, MXDEV, MXLAB, SEEVAL and The Embedded Control Solutions Company are registered trademarks of Microchip Technology Incorporated in the U.S.A. Analog-for-the-Digital Age, Application Maestro, CodeGuard, dsPICDEM, dsPICDEM.net, dsPICworks, dsSPEAK, ECAN, ECONOMONITOR, FanSense, HI-TIDE, In-Circuit Serial Programming, ICSP, Mindi, MiWi, MPASM, MPLAB Certified logo, MPLIB, MPLINK, mTouch, Octopus, Omniscient Code Generation, PICC, PICC-18, PICDEM, PICDEM.net, PICkit, PICtail, PIC32 logo, REAL ICE, rfLAB, Select Mode, Total Endurance, TSHARC, UniWinDriver, WiperLock and ZENA are trademarks of Microchip Technology Incorporated in the U.S.A. and other countries. SQTP is a service mark of Microchip Technology Incorporated in the U.S.A. All other trademarks mentioned herein are property of their respective companies. (c) 2009, Microchip Technology Incorporated, Printed in the U.S.A., All Rights Reserved. Printed on recycled paper. Microchip received ISO/TS-16949:2002 certification for its worldwide headquarters, design and wafer fabrication facilities in Chandler and Tempe, Arizona; Gresham, Oregon and design centers in California and India. The Company's quality system processes and procedures are for its PIC(R) MCUs and dsPIC(R) DSCs, KEELOQ(R) code hopping devices, Serial EEPROMs, microperipherals, nonvolatile memory and analog products. In addition, Microchip's quality system for the design and manufacture of development systems is ISO 9001:2000 certified. (c) 2009 Microchip Technology Inc. DS22153B-page 61 WORLDWIDE SALES AND SERVICE AMERICAS Corporate Office 2355 West Chandler Blvd. Chandler, AZ 85224-6199 Tel: 480-792-7200 Fax: 480-792-7277 Technical Support: http://support.microchip.com Web Address: www.microchip.com Atlanta Duluth, GA Tel: 678-957-9614 Fax: 678-957-1455 Boston Westborough, MA Tel: 774-760-0087 Fax: 774-760-0088 Chicago Itasca, IL Tel: 630-285-0071 Fax: 630-285-0075 Cleveland Independence, OH Tel: 216-447-0464 Fax: 216-447-0643 Dallas Addison, TX Tel: 972-818-7423 Fax: 972-818-2924 Detroit Farmington Hills, MI Tel: 248-538-2250 Fax: 248-538-2260 Kokomo Kokomo, IN Tel: 765-864-8360 Fax: 765-864-8387 Los Angeles Mission Viejo, CA Tel: 949-462-9523 Fax: 949-462-9608 Santa Clara Santa Clara, CA Tel: 408-961-6444 Fax: 408-961-6445 Toronto Mississauga, Ontario, Canada Tel: 905-673-0699 Fax: 905-673-6509 ASIA/PACIFIC Asia Pacific Office Suites 3707-14, 37th Floor Tower 6, The Gateway Harbour City, Kowloon Hong Kong Tel: 852-2401-1200 Fax: 852-2401-3431 Australia - Sydney Tel: 61-2-9868-6733 Fax: 61-2-9868-6755 China - Beijing Tel: 86-10-8528-2100 Fax: 86-10-8528-2104 China - Chengdu Tel: 86-28-8665-5511 Fax: 86-28-8665-7889 China - Hong Kong SAR Tel: 852-2401-1200 Fax: 852-2401-3431 China - Nanjing Tel: 86-25-8473-2460 Fax: 86-25-8473-2470 China - Qingdao Tel: 86-532-8502-7355 Fax: 86-532-8502-7205 China - Shanghai Tel: 86-21-5407-5533 Fax: 86-21-5407-5066 China - Shenyang Tel: 86-24-2334-2829 Fax: 86-24-2334-2393 China - Shenzhen Tel: 86-755-8203-2660 Fax: 86-755-8203-1760 China - Wuhan Tel: 86-27-5980-5300 Fax: 86-27-5980-5118 China - Xiamen Tel: 86-592-2388138 Fax: 86-592-2388130 China - Xian Tel: 86-29-8833-7252 Fax: 86-29-8833-7256 China - Zhuhai Tel: 86-756-3210040 Fax: 86-756-3210049 ASIA/PACIFIC India - Bangalore Tel: 91-80-3090-4444 Fax: 91-80-3090-4080 India - New Delhi Tel: 91-11-4160-8631 Fax: 91-11-4160-8632 India - Pune Tel: 91-20-2566-1512 Fax: 91-20-2566-1513 Japan - Yokohama Tel: 81-45-471- 6166 Fax: 81-45-471-6122 Korea - Daegu Tel: 82-53-744-4301 Fax: 82-53-744-4302 Korea - Seoul Tel: 82-2-554-7200 Fax: 82-2-558-5932 or 82-2-558-5934 Malaysia - Kuala Lumpur Tel: 60-3-6201-9857 Fax: 60-3-6201-9859 Malaysia - Penang Tel: 60-4-227-8870 Fax: 60-4-227-4068 Philippines - Manila Tel: 63-2-634-9065 Fax: 63-2-634-9069 Singapore Tel: 65-6334-8870 Fax: 65-6334-8850 Taiwan - Hsin Chu Tel: 886-3-6578-300 Fax: 886-3-6578-370 Taiwan - Kaohsiung Tel: 886-7-536-4818 Fax: 886-7-536-4803 Taiwan - Taipei Tel: 886-2-2500-6610 Fax: 886-2-2508-0102 Thailand - Bangkok Tel: 66-2-694-1351 Fax: 66-2-694-1350 EUROPE Austria - Wels Tel: 43-7242-2244-39 Fax: 43-7242-2244-393 Denmark - Copenhagen Tel: 45-4450-2828 Fax: 45-4485-2829 France - Paris Tel: 33-1-69-53-63-20 Fax: 33-1-69-30-90-79 Germany - Munich Tel: 49-89-627-144-0 Fax: 49-89-627-144-44 Italy - Milan Tel: 39-0331-742611 Fax: 39-0331-466781 Netherlands - Drunen Tel: 31-416-690399 Fax: 31-416-690340 Spain - Madrid Tel: 34-91-708-08-90 Fax: 34-91-708-08-91 UK - Wokingham Tel: 44-118-921-5869 Fax: 44-118-921-5820 03/26/09 DS22153B-page 62 (c) 2009 Microchip Technology Inc. |
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